Aren't asteroids very varied in terms of compactness? Aren't some asteroids piles of rubble and some others really hard rocks? Maybe I am confused but I'd guess this would also play a role?
The Roche Limit specifically applies to loose, gravitationally-bound bodies.
Chemically bonded objects e.g. solid rock or a huge diamond could approach closer to the planet without breaking up due to tidal forces, depending on the bulk material strength and melting point.
Chemically bonded objects e.g. solid rock or a huge diamond could approach closer to the planet without breaking up due to tidal forces, depending on the bulk material strength and melting point.